Speaking skills. Pick up hot chicks, flirting is the key. The point is that some people say they can't talk. Especially beautiful women. To get rid of this shyness, it is important to talk to girls more. Practice more. You can find a book about speaking skills to practice.
Build your own attraction. Why should sister talk to you? Because you have something that attracts this girl. Establish your own attraction and make your sister think you are very powerful.
Meet more girls. Many people are tied behind their hands when talking to their sisters, for fear of making them angry. As everyone knows, this kind of chat is the easiest for a girl to get bored. You can flirt and say whatever you want. Don't be afraid of your sister getting angry. Get to know more girls. So that girls will not be so mysterious in your heart.
Improve yourself. If you don't explain this, you are not good. How can we attract girls?
Except learning speaking skills, all methods need to change themselves. If you don't have a girl, you can only say that you haven't changed enough and don't want to change. It's impossible to succeed.